<template>
	<view class="u-wrap">
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item"
					:class="[current==index ? 'u-tab-item-active' : '']" :data-current="index"
					@tap.stop="swichMenu(index,item.name)">
					<text class="u-line-1">{{item.name}}</text>
				</view>
			</scroll-view>
			<block v-for="(item,index) in tabbar" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current==index">
					<view class="page-view">
						<view class="class-item">
							<view class="item-title">
								<text>{{item.name}}</text>
							</view>
							<u-skeleton rows="6" :loading="dataLoading">
								<view @click="toDetails(item.id)" class="card" v-for="(item,index) in dataList"
									:key="index">
									<view style="margin-right: 5px;">
										<image style="width: 50px; height: 50px; border-radius: 8px;" :src="item.image">
										</image>
									</view>
									<view>
										<text class="text_recommend">{{item.name}}</text>
									</view>
								</view>
							</u-skeleton>

							<!-- 空状态 -->
							<view v-if="isEmpty">
								<u-empty icon="http://cdn.uviewui.com/uview/empty/car.png">
								</u-empty>
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
	import classifyData from "@/common/classify.data.js";
	import {
		queryGoodsWithName
	} from "@/api/category/index.js";
	import {
		onLoad
	} from "@dcloudio/uni-app";

	export default {
		data() {
			return {
				tabbar: classifyData,
				dataList: [],
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				dataLoading: true,
				isEmpty: false
			}
		},
		onLoad() {
			this.getData();
		},
		methods: {
			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index, name) {
				this.dataList = [];
				this.isEmpty = false;
				if (index == this.current) return;
				this.current = index;
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;

				//发送分类数据请求
				queryGoodsWithName(name).then((res) => {
					if (res.code === 200 && res.data !== null) {
						this.dataList = res.data;
						this.dataLoading = false;
					} else {
						this.dataLoading = false;
						this.isEmpty = true;
					}
				})
			},

			getData() {
				//发送分类数据请求
				let name = "女装";
				queryGoodsWithName(name).then((res) => {
					if (res.code === 200 && res.data !== null) {
						this.dataList = res.data;
						this.dataLoading = false;
					} else {
						this.dataLoading = false;
						this.isEmpty = true;
					}
				})
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					}).exec();
				})
			},
			//跳往商品详情页
			toDetails(goodsId) {
				uni.navigateTo({
					url: "/pages/detail/detail?goodsId=" + goodsId
				})
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
		background-color: #FFEBCD;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid $u-primary;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		padding: 16rpx 10rpx 16rpx 16rpx;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx 10rpx 16rpx 16rpx;
		border-radius: 8rpx;
	}

	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
	}

	.card {
		display: flex;
		margin-top: 12px;
		// padding: 5px 0 5px 5px;
		width: 100%;
		height: 60px;
		background-color: #F5F7FA;
		border-radius: 6px;
		// box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
	}

	.card:active {
		background-color: #fff;
		opacity: 1;
	}

	.text_recommend {
		font-size: 13px;
		color: #303133;
		font-weight: 500;
		display: -webkit-box;
		-webkit-box-orient: vertical;
		-webkit-line-clamp: 2;
		overflow: hidden;
		text-overflow: ellipsis;
		font-family: "华文楷体";
	}
</style>